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A Parameterized PostFriedmann Framework for Modified Gravity
We develop a parameterized postFriedmann (PPF) framework which describes three regimes of modified gravity models that accelerate the expansion without dark energy. On large scales, the evolution of scalar metric and density perturbations must be compatible with the expansion history defined by dis... Full description
Contributors: 
Hu, Wayne
 Author Sawicki, Ignacy  Author 
Published: 
2007

Contained in:  arXiv.org (2007) vom: 08. Aug. 
Journal Title:  arXiv.org 
Fulltext access:  Fulltext access (direct link  free access) 10.1103/PhysRevD.76.104043
Availability is being checked...

Links: 
Volltext (dx.doi.org) Volltext (arxiv.org) 
DOI: 
10.1103/PhysRevD.76.104043 
Language: 
English 
ID (e.g. DOI, URN): 
10.1103/PhysRevD.76.104043 
PPN (CatalogueID):  XAR001120727 
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245  1  0  a A Parameterized PostFriedmann Framework for Modified Gravity 
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520  a We develop a parameterized postFriedmann (PPF) framework which describes three regimes of modified gravity models that accelerate the expansion without dark energy. On large scales, the evolution of scalar metric and density perturbations must be compatible with the expansion history defined by distance measures. On intermediate scales in the linear regime, they form a scalartensor theory with a modified Poisson equation. On small scales in dark matter halos such as our own galaxy, modifications must be suppressed in order to satisfy stringent local tests of general relativity. We describe these regimes with three free functions and two parameters: the relationship between the two metric fluctuations, the large and intermediate scale relationships to density fluctuations and the two scales of the transitions between the regimes. We also clarify the formal equivalence of modified gravity and generalized dark energy. The PPF description of linear fluctuation in f(R) modified action and the DvaliGabadadzePorrati braneworld models show excellent agreement with explicit calculations. Lacking cosmological simulations of these models, our nonlinear halomodel description remains an ansatz but one that enables wellmotivated consistency tests of general relativity. The required suppression of modifications within dark matter halos suggests that the linear and weakly nonlinear regimes are better suited for making complementary test of general relativity than the deeply nonlinear regime.  
700  1  a Hu, Wayne e verfasserin 4 aut  
700  1  a Sawicki, Ignacy e verfasserin 4 aut  
773  0  8  i Enthalten in t arXiv.org g (2007) vom: 08. Aug. 
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856  4  0  u https://arxiv.org/abs/0708.1190 z Kostenfrei 3 Volltext 
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